An underwater photographer has captured what can only be described as an undersea tornado of swirling fish seen mesmerizing divers off Mexico's coast.

Thousands of fish banded together to produce the churning mass of eyes, mouths and fins on the bottom of the Sea of Cortez’s Cabo Pulmo National Park in what photographer and scientist Octavio Aburto calls a natural though extremely rare phenomenon.

'In the afternoon, these fish congregate to form a large spawning aggregation around the reefs of the National Park,' Mr Aburto wrote with a photo since entered into National Geographic's 2012 photo contest.

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Twister: This underwater tornado composed entirely of swimming fish was captured by mesmerized divers, one seen left, off Mexico's coast last month

Many accuse him of photoshopping his images or corralling the fish unnaturally into one place for the magnificent act.

‘One reason that the average person may not know about these fish spawning aggregations is simply that these creatures live underwater. People can’t see the fish participating in these behaviors, and those who do witness these behaviors via scuba or snorkel are very rarely able to capture it in an image,’ he told Mission Blue.

‘The other major problem is that it has become increasingly more rare to see these types of spawning aggregations because overfishing has left fish stocks so depleted,’ he said.

Working as a researcher for Cabo Pulmo for more than 15 years, Mr Aburto says he hopes his photographs will raise awareness of devastation inflicting the national undersea parks, as well as their preservation through conscious effort.